Cross-lock for calculator special keys.



W. FUHRMANN & E. M. SQUAREY.

CROSS LOCK FOR CALCULATOR SPECIAL KEYS.

xAPPLICATlON FILED JUNE I8 1917- Patented Feb. 11, 1919.

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UNITED STATES PATENT OFFICE.

WARREN FUHRNIANN, OF WESTEIELID, NEW JERSEY, AND SQUAREY, OF' TUCKAHOE, NEW YORK, ASSIGNORS, BY MESNE ASSIGNMENTS, TO. WILKJI'NSON BROTHERS AND COMPANY, INCORPORATED, OF NEW YORK, N. .Y- A CORPORATION OF NEW YORK.

CROSS LOCKFOR CALCULATOR SPECIAL KEYS;

Application filed June 18, 1917. Serial No. 175,279.

To. all whom it may concern:

Be itknown thatwe, WARREN FUHRMANIv,

a citizen of the United States, and a memdent of WVestfield, in the county of Union and State of New Jersey, and EDWARD, M. S UAREY, a subject of the King of Great Britain, and a resident of Tuckahoe, county of VVestchester, and State of New York, have invented certain new and useful Improvements in Cross-Locks for Calculator Special Keys, of which the following is a specification.

The object of this invention is to provide an improved means for preventing operation of a machine by the normal operating means, during the act of depressing or actuating a member that is to cause aspecial operation of the machine, until the member is depressed to the limit of its movement.

The present, invention is especially designed for use with the total or sub-total keys in a calculating machine, whereby the handle or main shaft is locked at once on depression of either key stem, and is not released until the key stem has been depressed the full or proper distance.

This invention is particularly applicable to the total and sub-totalmechanism as set forth in U. S. Patent, Serial No. 1,232,007 wherein the depression of the total or the sub-total key serves to move a lever and swing a rock shaft.

In the accompanying drawing showing one embodiment of my invention, Figur 1 is a plan view. Fig. 2 is a side elevation. Fig. 3 is the same view with the parts ad'- vanced. Fig. 4 is a partial bottom plan, and Figs. 5 and 6 show the key controlllng means.

As shown in the drawings 6 represents the right hand side plate, and 7 the left hand side plate, of the machine. A shaft 8 carries the handle 9, and also a segment 10, on which is a fixed stud 12. A look arm 13 is pivoted on a stud 14 on the side plate and drawn by spring 15 to cause 1ts hook extremity 16 to engage back of the stud 12 on the segment, to retain the segment in normal position and prevent its being advanced by the handle, as indicated 1n Fig. 3. A stop arm 17 is fast on a cross shaft 18 that on, the opposite side of the machine is se cured to a lever 19. This lever carries a Specification of Letters latent.

Patented Feb, 11,1919.

short arm 20 provided with a pin 21 th;at is; engaged by a key stem 2,2, ghat is;;indjicated 1 ig- A secondrkey stern-2312 180 eng ges th pin 21 when depresse Upon depression of either of thes'eikey, stems-the e er .1 wil swing o rock v.thesha t 18,.and swing the stop arm 17. On the lockarmli: is secured a stud 24 thatis engagedqby:the stop arm 17 in its normalposition,.see Fig. 2, whereby to holdthe hookportion 16-away' from the studn12 against the tension-oi the spring 15; This will freeathestudz ,=,l2- an d permit rocking of the segment: 10!- B1 1 when either of the saidtkey stems is .depressed the lock arm 17; will swingdown-.- ward away from .thestud 24, andthespririg 15 will swing the stop. arm to-engage ,:the stud 12 and lock the segment againstmove ment. Upon full swingingof the lock arm 17, it will strike a lug 25 on a bent lever26 whose upright arm 27 projects into a slot 28in the stop arm 13. The finaldownward movement of the lock arm will thus swing the lever 26, whosearm 27 will rocktheann 13, to move its hookendout of engagement with the stud 12 on the segment. A bent. lever or pawl 29 is pivotedvat30 andhasits recessed end 30 engaging the stud 24 on the stop arm and is swung to thisxposition.

the stud 24 and serve to lock the stoparm.

in the position free from the. stud 12. The parts will remain in these positions during the return of the arm 17, that is usually not returned until the keys 22 and 23 are retracted at the latter portion of the o eration of the machine. After the arm 1 is returned to normal position, and. swung upwardly its extremity will first strike a stud 32 on the pawl 29, that will swing the pawl back away from the stud 24 and retain it in such position. But at this time the arm 17 will also strike the stud 24 and thus serve to hold the stop arm 13 in the position shown in Fig. 1 free from the stud 12 on the segment. This returns the parts to normal position. It will be understood that when the arm 17 first swings downward the arm 13 will be drawn to engage the stud 12 and the stud 24 on the stop arm will move down free from the pawl 29, and does not engage the same until the arm 17 strikes the lever 26 to swing the stoparm upward and permit the pawl to engage the stud 24.

It will be understood that from this construction, when the key is first depressed the segment is locked at once and retained locked until the key becomes fully depressed.

At this time the segment is released, and is.

not again locked during the retraction of one of the keys until the final part of the return movement of the key.

Having thus described our invention, what we claim is 1. The combination of anoperating member, an actuating member movable from a certain normal position to a certain fully advanced position, and a locking device normally free from the operating member, but arranged to be advanced at once on the initial movement of the actuating member and brought to engage the operating member and prevent advance thereof from normal position, which locking member is retained in such locking position until the final advance movement of the actuating member whereupon the locking member is shifted to release the operating member, and means for retaining the locking member outof locking position during the entire return movement of the said actuating member.

2. The combination of an operating memher, an actuating member movable from a certain normal position to a certain fully advanced position, a lock arm arranged to engage the operating member, a stop arm connected withthe actuating member and normally holding the lock arm in a neutral position, said stop arm acting to release the lock arm to permit it to move to engaging positionat once upon advance of the actuating member, a lever connected with the lock arm and engagedby the said stop arm at the limit of its advance movement to swing the lock'armaway from said engaging position,

and a pawl arranged to engage the lock arm upon its said movement by the said lever whereby to hold the lock arm in neutral position, the said stop arm upon return of the actuating member to normal position serving to shift the pawl free from the lock arm and also to re'elngage the lock arm to hold it in normal neutral position.

3. The combination of an operating memher, an actuating member movable from a certain normal position to a certain fully advanced position, a stud on the operating member, a lock arm arranged to engage said stud, a spring on the lock arm to shift it to said stud engaging position, a stud on the lock arm, a stop arm connected with the actuating member and normally engaging the lock arm stud to hold the lock arm in neutral position out of range of the stud on the operating member, said stop arm on initial movement of the actuating member acting to free the lock arm to be swung by its spring to engage said operating member stud and lock the operating member, a lever connected with the lock arm and arranged to be engaged by the stop arm at the final portion of the advance movement of the stop arm whereby the lock arm is swung to shift it out of said engaging position with the operating member, a pawl arranged to engage the stud on the lock arm, a spring arranged tO shift the pawl to said engaging position, and a stud on the pawl arranged to be engaged by the stop arm at the latter portion of its return stroke whereby the pawl is swung away from the stud on the lock arm, and the lock arm stud is thereupon engaged by the stop arm when returned to normal position to shift and retain the lock arm out of engaging position with the operating member, the lock arm spring being tensioned to overcome the tension of the said pawl spring.

WARREN FUHRMANN. EDWARD M. SQUAREY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 1). G3 

